Photographic-plate holder



(No Model.)

G. WHITNEY. PHOTOGRAPHIG PLATE HOLDER.

Patented Peb. 10,1891. I gj.

UNITED STATES PATENT OEEcE.

CHARLES l/YIII'INEY, OF CHICAGO, ILLINOIS.

PHOTOGRAPHlC-PLATE HOLDER.

SPECIFICATION forming part of Letters Patent No. 446,371, dated February 10, 1891.

Application filed February 3,1890. Serial No. 339,046. (No model.) Patented in Italy April 29, 1890, No. 27,256/333; in Gnnada July 2, 1890, No. 34,607, and in France July 17,1890,No. 204,797.

To @ZZ 107mm it may] concern:

Be it known that l, CHARLEs WHITNEY, a citizen of the United States, residing at Chicago, in the county of Cool; and State of Illinois, have invented new and useful Improvements in Photographic -Plate llolders for Cameras, (patented to me in France, No. 20e/797, dated July I7, 18H0, in Italy, No. 27,256/3233, dated April 2l), i890, and in Canada, No. 34,607, lated .Iuly 2, 1890,) of which the following is a specification.

My invention relates to improvements in photographic cameras in which one or more friction feed-rollers are used; andthe objects of my improvements are to provide a receptacle or magazine for a series of plates cut to any desired size and means for feeding them to the proper position for exposure, and in providing a receptacle and means for placing the plates therein after the exposure is made, and also means for determining the proper position of them for exposure. I attain these objects by the mechanism illustrated in the accompanyingl drawings, in which- Figure l is a front view. Fig. 2 is an end view. Figs. and t are cross-sectional views.

Similar lei ters refertosimilar parts lh roughout the several views, in which- A isvthe main frame, and B the slide; C, the thumb-wheel; D, the lifting-bar attached to lthe slide.

Il are the negative-plates.

M is a frame supporting the unexposed plates pivoted and held in position at X.

R is a glass support, and J is a wedge-shaped block, between which and the glass It the negative-plate is held in position.

S is a spring which holds the plaies againstthe feed-roller.

U U are index-points'on chain V.

XV are chain-pulleys attached lo the shaft of the feed-rollers.

I I are the feed-rollers l'or moving the plates.

In operation my invention is an attachment for cameras, and may be made of any size required for the various-sized cameras and attached or connected in the usual manner for plate-holders or roll-holders. By removing the back board of main frame A the platereceptacle )I is swung out and filled with iiexible plates properlysensitized. rFhe back board is then replaced, and the pressure of the springs S holds the upper end of the negative, against the feed-roller. By turning the thumb-wheel C until the chain V has made one-half revolution a plate is brought into position for exposure, the engagement of the upper feed-roller having forced the plate between the glass R- and block J. In this position the slide l is withdrawn andthe exposure is made. liy revolving the feed-rollers inthe direction indicated by the arrow in Fig. 2 another plate is brought into position for exposure, and the previously-exposed plate is forced into space N by engaging with the lower feed-roller. rlhe feed-rollers I are held in unison by the chain Y, andthe position of the plate is determined by the index-points on the chain.

I do not claim as my invention the broad feature of a rotary transferring device which impinges upon the surface of the sensitive plate or its holder for the purpose of transferring it from one compartment to another; but,

lIaving thus described my invention, what I claim isl. In a plate-holder for cameras, the coinbination of the magazine of plates, the block J, the feed-rollers I', and the glass-support R, substantially as described.

2. In a plate-holder attachment forcameras,

the chain X, with index-points U U and pul-.

leys W arranged for keeping the feedrollers in unison and designating the distance of length of travel for each plate, substantially as described.

3. In a plateholder for cameras, the combination of the feed-rollers I', the pulleys lV, and the chain V, substantially as described.

t. In a pliotographic-plate holder for cameras, the friction-rollers I l', one adapted to force the plate into position for exposure and the other adapted to force it into the space N, in combination with the cha-in V and the pulleys W, substantially as described.

CHARLES XVIII'INEY.

Witnesses:

O. W. Borvo,

E. I-IUELB ufr. 

